The last o/p sent to you is without IPtables firewall. Now I have disabled and all checks related to node connectivity passed.
DNS check is still failing on both the nodes.
Below is the o/p from runcluvfy.sh script:
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Checking consistency of file "/etc/resolv.conf" across nodes

Checking the file "/etc/resolv.conf" to make sure only one of domain and search entries is definedFile "/etc/resolv.conf" does not have both domain and search entries definedChecking if domain entry in file "/etc/resolv.conf" is consistent across the nodes...domain entry in file "/etc/resolv.conf" is consistent across nodesChecking if search entry in file "/etc/resolv.conf" is consistent across the nodes...search entry in file "/etc/resolv.conf" is consistent across nodesChecking DNS response time for an unreachable nodeNode Name Status------------------------------------ ------------------------rac2 failedrac1 failedPRVF-5636 : The DNS response time for an unreachable node exceeded "15000" ms on following nodes: rac2,rac1